不属于高压电器试验项目的是()。
A.高压电器绝缘试验
B.高压开关设备机械试验
C.电气及机械的寿命试验
D.负载试验
参考答案:D
He turned down the request of his friend because it was the limit of his power.
A.beyond
B.over
C.off
D.above
在我国,建筑耐火等级最高为一级。